CN207368987U - A kind of digital resources obtainment amplifying circuit - Google Patents
A kind of digital resources obtainment amplifying circuit Download PDFInfo
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- CN207368987U CN207368987U CN201721352235.2U CN201721352235U CN207368987U CN 207368987 U CN207368987 U CN 207368987U CN 201721352235 U CN201721352235 U CN 201721352235U CN 207368987 U CN207368987 U CN 207368987U
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Abstract
A kind of digital resources obtainment amplifying circuit is the utility model is related to, which includes automatic gain control circuit and three-stage amplifier；Automatic gain control circuit includes ADC sample circuits and MCU；Three-stage amplifier includes programme-controlled gain amplifying circuit, first order DAC amplifying circuits and second level DAC amplifying circuits；The input terminal of the output terminal connection first order DAC amplifying circuits of programme-controlled gain amplifying circuit, the input terminal of the output terminal connection second level DAC amplifying circuits of first order DAC amplifying circuits, the input terminal of the output terminal connection ADC sample circuits of second level DAC amplifying circuits, the output terminal connection MCU of ADC sample circuits；MCU connects programme-controlled gain amplifying circuit, first order DAC amplifying circuits and second level DAC amplifying circuits respectively.The utility model can realize the wide scope of amplification factor, continuous, adjust automatically, and have high bandwidth.
Description
Technical field
The utility model belongs to electronic circuit technology field, is related to digital Auto Gain, and especially a kind of numeral is automatic to be increased
Benefit control amplifying circuit.
Background technology
In general, it is both provided with increasing for adjusting the automatic of gain of received signal in the device of the signal detections such as instrument and meter
Benefit control (Automatic Gain Control, hereinafter referred to as " AGC ") amplifying circuit.Because instrument and meter device is usually examined
The amplitude of the original signal of survey is small, and excursion is wide, it is necessary to is put the amplitude of signal using amplifying electric circuit with auto-gain-controlling function
It is big and stable in a level set or an error range, so as to provide a stabilization for the functional circuit module of rear class
Input signal, can thus greatly improve the accuracy of instrument and meter device.
AGC amplifying circuits of the prior art, all employ programme-controlled gain amplifying circuit cascade ratio amplifying circuit substantially
This structure, wherein scaling circuit realized by the way of digital regulation resistance or analog switch build-out resistor more.Patent
106230398 A of specification CN just employ the form of digital regulation resistance amplifying circuit, the times magnification that this circuit can be realized
Series of the number depending on potentiometer, most 256 grades at present, so the amplification factor scope of this circuit structure can only achieve 1~
256, and the bandwidth of digital regulation resistance is limited to, this circuit structure is only capable of being amplified low frequency signal；Patent specification
204190708 U of CN employ the form of the amplifying circuit cascade of analog switch build-out resistor, and the amplification factor that can be realized is only
There are 8 grades.It can be seen from the above that this circuit structure can not accomplish fine-tuning for amplification factor, and amplification factor adjusting range
It is very limited.
Secondly, the AGC amplifying circuits of the prior art all employ the mode of analog feedback control, utilize peak detection electricity
The hardware circuits such as road, comparison circuit, error amplifying circuit carry out automatically controlling for gain, and circuit structure is complicated, and flexibility is not high
And hardware cost is higher.Patent specification CN106571787 just employs this technology type.
Utility model content
The purpose of the utility model is to overcome the shortcomings that the above-mentioned prior art, there is provided a kind of digital resources obtainment is put
Big circuit, it can realize the wide scope of amplification factor, continuous, adjust automatically, and have high bandwidth.
The purpose of this utility model is achieved through the following technical solutions：
The digital resources obtainment amplifying circuit of the utility model, including automatic gain control circuit and increase with automatic
The three-stage amplifier of beneficial control circuit connection；The automatic gain control circuit includes ADC sample circuits and MCU；Described three
Level amplifying circuit includes programme-controlled gain amplifying circuit, first order DAC amplifying circuits and second level DAC amplifying circuits；It is described program-controlled
The output terminal of gain amplifying circuit is connected to the input terminal of first order DAC amplifying circuits, the output terminal of first order DAC amplifying circuits
The input terminal of second level DAC amplifying circuits is connected to, the output terminal of the second level DAC amplifying circuits is connected to ADC sampling electricity
The input terminal on road, the output terminal of the ADC sample circuits are connected to MCU；The MCU is respectively connected to programme-controlled gain amplification electricity
Road, first order DAC amplifying circuits and second level DAC amplifying circuits.
Further, above-mentioned programme-controlled gain amplifying circuit includes programmable gain amplifier, the programmable gain amplifier
It is connected with power supply.
Further, above-mentioned Programmable Gain Amplifier Circuit is to be total to the program-controlled of level Four with 1 times, 10 times, 100 times and 1000 times
Gain amplifier.
Further, above-mentioned first order DAC amplifying circuits and second level DAC amplifying circuits be by current-output type DAC and
The reverse amplification circuit that operational amplifier is formed.
Further, the input signal of above-mentioned reverse amplification circuit is connected to the feedback signal of the current-output type DAC and draws
Foot；The positive input of the operational amplifier is connected to signal ground, the output terminal of operational amplifier is connected to current-output type
Output of the reference voltage input pin of DAC as reverse amplification circuit.
Further, above-mentioned current-output type DAC is made of inverted T shaped R-2R resistor networks.
Compared with prior art, the utility model has the advantages that：
The utility model employs three-level amplification, realizes the gain-adjusted of wide scope.Wherein the first order is programme-controlled gain
Amplifying circuit, for carrying out the coarse adjustment of gain, and can improve the signal-to-noise ratio of signal, compared to the amplification electricity of traditional structure
Road, greatly reduces the complexity of circuit.The second level of the utility model and third level amplification are DAC amplifying circuits, into
One step expands gain-adjusted scope, it is often more important that realizes the intense adjustment of amplification factor.Mould is relied on different from traditional
Intend switch build-out resistor or potentiometer realizes the scaling circuit of amplification factor switching, the gain control of DAC amplifying circuits
Fineness higher, bandwidth are also wider.
Further, the utility model passes through after three-level gain-adjusted, and ADC sample circuits and MCU carry out signal amplitude
Digital closed loop is fed back so that the amplitude stability of signal eliminates analog feedback control circuit, simplify and set on setting value Vset
Count, reduce cost, and the flexibility with higher.
Brief description of the drawings
Fig. 1 is the electrical block diagram of the utility model；
Fig. 2 is DAC amplifying circuit schematic diagrames；
Fig. 3 is DAC cut-away views；
Fig. 4 is the digital quantity and amplification factor graph of relation of DAC amplifying circuits.
Wherein：4.1 be programme-controlled gain amplifying circuit；4.2 be first order DAC amplifying circuits；4.3 amplify for second level DAC
Circuit；4.4 be ADC sample circuits；4.5 be MCU.
Embodiment
Technical solutions of the utility model are described in further detail with specific embodiment below in conjunction with the accompanying drawings, it is described
Specific embodiment only explains the utility model, is not intended to limit the utility model.
Referring to Fig. 1, the digital resources obtainment amplifying circuit of the utility model, including automatic gain control circuit and
The three-stage amplifier being connected with automatic gain control circuit；Automatic gain control circuit includes ADC sample circuits 4.4 and MCU
4.5；Three-stage amplifier includes programme-controlled gain amplifying circuit 4.1, first order DAC amplifying circuits 4.2 and second level DAC amplification electricity
Road 4.3；The output terminal of programme-controlled gain amplifying circuit 4.1 is connected to the input terminal of first order DAC amplifying circuits 4.2, first order DAC
The output terminal of amplifying circuit 4.2 is connected to the input terminal of second level DAC amplifying circuits 4.3, second level DAC amplifying circuits 4.3
Output terminal is connected to the input terminal of ADC sample circuits 4.4, and the output terminal of ADC sample circuits 4.4 is connected to MCU 4.5；MCU
4.5 are respectively connected to programme-controlled gain amplifying circuit 4.1, first order DAC amplifying circuits 4.2 and second level DAC amplifying circuits 4.3.
The programme-controlled gain amplifying circuit 4.1 of the utility model includes programmable gain amplifier, the programmable automation controller
Circuit is the Programmable Gain Amplifier Circuit with 1 times, 10 times, 100 times and 1000 times common level Four, it is connected with power supply.Benefit
In the high input impedance and high cmrr of programmable gain amplifier, can greatly improve for carrying out first order amplification
Signal quality.
Referring to Fig. 2：The first order DAC amplifying circuits 4.2 and second level DAC amplifying circuits 4.3 of the utility model be by
The reverse amplification circuit that current-output type DAC and operational amplifier OP is formed.The input signal Vin connections of the reverse amplification circuit
To the feedback signal pin Rfb of the current-output type DAC；The positive input of operational amplifier OP is connected to signal ground, fortune
The output terminal for calculating amplifier OP is connected to the reference voltage input pin Vref of current-output type DAC as reverse amplification circuit
Export Vout.
Referring to Fig. 3：The current-output type DAC of the utility model is made of inverted T shaped R-2R resistor networks.Inside DAC
Resistor network, it is possible to achieve the amplification factor of different gains, the resolution ratio of DAC is higher, then the Gain tuning of DAC amplifying circuits
Scope is wider, Gain tuning fine degree is higher.
The amplification factor calculation formula of the utility model circuit is as follows：
A=A1*A2*A3(1)
Wherein, A is total magnification, the A of the utility model circuit1Amplification factor for programme-controlled gain amplifying circuit 4.1,
A2Amplification factor, A for first order DAC amplifying circuits 4.23For the amplification factor of second level DAC amplifying circuits 4.3.
(hereinafter referred to as DAC amplifies for the utility model first order DAC amplifying circuits 4.2 or second level DAC amplifying circuits 4.3
Circuit) amplification factor calculation formula it is as follows：
Wherein, the digital quantity that G is the amplification factor of DAC amplifying circuits, N is DAC resolution ratio digit, Code are DAC.With
Exemplified by the DAC of 10 bit resolutions, the gain adjustment range of DAC amplifying circuits is up to 1~210, and Code often changes a number,
The gain of DAC amplifying circuits will change, therefore can realize fine-tuning for gain.
The digital quantity and amplification factor relation song of DAC can be drawn out by the amplification factor calculation formula of DAC amplifying circuits
Line, as shown in Figure 4.As can be seen that when digital quantity is closer to 210When, the gain-adjusted of DAC amplifying circuits is finer；Digital quantity is got over
Close to 1, the interval of gain is bigger.Therefore, the digital quantity of DAC should be made in actual use close proximity to 210。
The output of second level DAC amplifying circuits is connected to the input of ADC sample circuits, and the ADC sample circuits mainly wrap
High-speed ADC and its peripheral circuit are included, realizes and analog-to-digital conversion is carried out to amplified waveform, and transformation result is fed back into MCU.
The operation principle of the utility model amplifying circuit is as follows：
The data that MCU 4.5 gathers ADC sample circuits 4.4 are analyzed, and detect the amplitude of the peak value of waveform, then with
Setting value Vset makes the difference relatively and carries out PID control, then calculates the respective amplification factor of three-stage amplifier.By cardinar number
The peak detection and closed loop control algorithm of word, can make amplified signal amplitude stabilization in setting value Vset.
It is preferentially real using programme-controlled gain amplifying circuit 4.1 for the control method of the respective amplification factor of three-stage amplifier
The now amplification of big multiple, then realizes the supplement of amplification factor using the DAC amplifying circuits of two-stage.For example, working as needs to realize
During 4000 times of amplifications, according to formula (one), there are the two schemes optional：
Scheme one：Programme-controlled gain amplifying circuit 4.1 is made to realize that 10 times of amplifications, first order DAC amplifying circuits 4.2 realize 200
Amplification, second level DAC amplifying circuits 4.3 realize 2 times of amplifications again；
Scheme two：Programme-controlled gain amplifying circuit 4.1 is made to realize that 1000 times of amplifications, first order DAC amplifying circuits 4.2 realize 2
Amplification, second level DAC amplifying circuits 4.3 realize 2 times of amplifications again.
For scheme one, can be calculated by formula (two) needs to set the Code of the DAC of first order DAC amplifying circuits 4.2
For 5.12, and the Code of DAC is necessary for integer, therefore may be only configured to 5, then the amplification factor of first order DAC amplifying circuits 4.2
It is changed into 204.8 times, then three-stage amplifier total magnification is changed into 4096 times, far above required amplification factor；
For scheme two, it can be calculated and the Code of the DAC of first order DAC amplifying circuits 4.2 need to be set according to formula (two)
It is precisely integer for 512, moreover, even if the Code of DAC is arranged to 513, the amplification factor of first order DAC amplifying circuits 4.2
It is changed into 1.996, then three-stage amplifier total magnification is changed into 3992 times, its accuracy is far above scheme one.
In addition, above case study on implementation only represents to implement an example of the utility model, rather than accordingly to the utility model
Being defined property of technical scope explanation, can select that there is the programmable-gain of different amplification to put in actual use
The DAC of big device and different resolution digit, every any letter made according to the utility model technical spirit to above example
Single modification, equivalent variations and modification, belong to the protection domain of technical solutions of the utility model.
Claims (6)
- A kind of 1. digital resources obtainment amplifying circuit, it is characterised in that including automatic gain control circuit and with it is automatic The three-stage amplifier of gain control circuit connection；The automatic gain control circuit includes ADC sample circuits (4.4) and MCU (4.5)；The three-stage amplifier includes programme-controlled gain amplifying circuit (4.1), first order DAC amplifying circuits (4.2) and second Level DAC amplifying circuits (4.3)；The output terminal of the programme-controlled gain amplifying circuit (4.1) is connected to first order DAC amplifying circuits (4.2) input terminal, the output terminal of first order DAC amplifying circuits (4.2) are connected to the defeated of second level DAC amplifying circuits (4.3) Enter end, the output terminal of the second level DAC amplifying circuits (4.3) is connected to the input terminal of ADC sample circuits (4.4), the ADC The output terminal of sample circuit (4.4) is connected to MCU (4.5)；The I/O ports of the MCU (4.5) are respectively connected to programme-controlled gain and put DAC in the gain control end and first order DAC amplifying circuits (4.2), second level DAC amplifying circuits (4.3) of big circuit (4.1) Control terminal.
- 2. digital resources obtainment amplifying circuit according to claim 1, it is characterised in that the programme-controlled gain amplification Circuit (4.1) includes programmable gain amplifier and peripheral resistance, and the programmable gain amplifier is connected with power supply.
- 3. digital resources obtainment amplifying circuit according to claim 2, it is characterised in that the programmable-gain is put Big circuit is the gain-programmed amplifier with 1 times, 10 times, 100 times and 1000 times common level Four.
- 4. digital resources obtainment amplifying circuit according to claim 1, it is characterised in that the first order DAC is put Big circuit (4.2) and second level DAC amplifying circuits (4.3) are made of current-output type DAC and operational amplifier (OP) Reverse amplification circuit.
- 5. digital resources obtainment amplifying circuit according to claim 4, it is characterised in that the reverse amplification circuit Input signal (Vin) be connected to the feedback signal pin (Rfb) of the current-output type DAC；The operational amplifier (OP) Positive input be connected to signal ground, the output terminal of operational amplifier (OP) is connected to the reference voltage of current-output type DAC Output (Vout) of the input pin (Vref) as reverse amplification circuit.
- 6. digital resources obtainment amplifying circuit according to claim 5, it is characterised in that the current-output type DAC is made of inverted T shaped R-2R resistor networks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721352235.2U CN207368987U (en) | 2017-10-19 | 2017-10-19 | A kind of digital resources obtainment amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721352235.2U CN207368987U (en) | 2017-10-19 | 2017-10-19 | A kind of digital resources obtainment amplifying circuit |
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| Publication Number | Publication Date |
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| CN207368987U true CN207368987U (en) | 2018-05-15 |
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| CN201721352235.2U Active CN207368987U (en) | 2017-10-19 | 2017-10-19 | A kind of digital resources obtainment amplifying circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919860A (en) * | 2017-10-19 | 2018-04-17 | 西安安森智能仪器股份有限公司 | A kind of digital resources obtainment amplifying circuit fine-tuned and its control method |
-
2017
- 2017-10-19 CN CN201721352235.2U patent/CN207368987U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919860A (en) * | 2017-10-19 | 2018-04-17 | 西安安森智能仪器股份有限公司 | A kind of digital resources obtainment amplifying circuit fine-tuned and its control method |
| CN107919860B (en) * | 2017-10-19 | 2024-01-26 | 西安安森智能仪器股份有限公司 | Fine-adjustment digital automatic gain control amplifying circuit and control method thereof |
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